Muwatta Malik 1167
موطأ مالك#1167Da'ifYahya related to me from Malik from Jafar ibn Muhammad from his father that Ali ibn Abi Talib said, "When a man takes a vow to abstain from intercourse, divorce does not occur immediately. If four months pass, he must declare his intent and either he is divorced or he revokes his vow . " Malik said, "That is what is done among us
Scholarly Authentication
We show the most cautious grade (weakest-wins) as the overall label. Individual scholars graded it as follows:
Salim al-HilaliMauquf Daif
In-book reference: 29:18